Beyonce credits a mostly plant-based diet and rigorous cardio workouts for her stunning recent weight loss, said her trainer.

"Beyoncé is all about health and wellness," exercise physiologist Marco Borges told E! "She just wants to feel good."

Beyonce made headlines after undergoing a 22-day vegan diet in December 2013 with her husband, Jay-Z. The couple emerged from their vegan-diet challenge looking noticeably slimmer.

Beyoncé, who's now a tiny size two, showed off her dramatic weight loss at the 2014 Grammy Awards. Borges, who has trained Beyoncé since 2007, said the singer now follows a mostly vegan diet.

"She's sticking to a mostly plant-based diet with some fish here and there," said Borges, CEO of 22 Days Nutrition, a maker of vegan, organic, gluten-free protein bars.

The 5-foot-7 Beyonce who weighed 195 pounds while pregnant, lost 65 pounds shortly afterward by following a strict diet and working out several days a week. She has since lost more weight. Borges said Beyonce's go-to snacks are 22 Days Nutrition Bars.

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Samantha Chang is the executive editor and co-owner of www.theimproper.com., an arts and entertainment website in New York City. A graduate of the University of Pennsylvania, Samantha enjoys running, cycling and taking photos. Contact her at schang@theImproper.com.